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Internet of things (IoT) is an emerging paradigm where the devices around us (persistent and non-persistent) are connected to each other to provide seamless communication, and contextual services. In the IoT, each device cannot be authenticated in the short time due to unbounded number of devices. Equally, it is difficult to get receipt of their authentication request at the same time. Therefore, secure, and efficient group authentication scheme is required that authenticates a group of devices at once in the context of resource constrained IoT. This paper presents novel Threshold Cryptography-based Group Authentication (TCGA) scheme for the IoT which verifies authenticity of all the devices taking part in the group communication. The proposed TCGA scheme is implemented for WIFI environment, and the result shows that TCGA scheme is lightweight, and alleviates the effect of battery exhaustion attack. This paper …